cmake: Don't add src/ to include path

Fully qualify includes instead

src/qtcommon/Platform_qt.cpp

@@ -10,8 +10,8 @@
 */
 
 #include "Platform_qt.h"
-#include "KDDockWidgets.h"
-#include "Window_qt.h"
+#include "kddockwidgets/KDDockWidgets.h"
+#include "kddockwidgets/Window_qt.h"
 
 #include <QWindow>
 #include <QDebug>

src/qtcommon/Platform_qt.h

@@ -11,9 +11,9 @@
 
 #pragma once
 
-#include "docks_export.h"
-#include "Platform.h"
-#include "Window_qt.h"
+#include "kddockwidgets/docks_export.h"
+#include "kddockwidgets/Platform.h"
+#include "kddockwidgets/Window_qt.h"
 
 namespace KDDockWidgets {
 

src/qtcommon/Window_qt.cpp

@@ -10,7 +10,7 @@
 */
 
 
-#include "Window_qt.h"
+#include "kddockwidgets/Window_qt.h"
 
 #include <QWindow>
 #include <QScreen>

src/qtcommon/Window_qt.h

@@ -11,7 +11,7 @@
 
 #pragma once
 
-#include "Window.h"
+#include "kddockwidgets/Window.h"
 
 #include <QPointer>